<mt:HasNoParentCategory>
Returns true if the current category does not have a parent category other than the root.
Example:
<mt:Categories>
<mt:HasNoParentCategory>
<mt:CategoryLabel> is but an orphan and has no parents.
<mt:else>
<mt:CategoryLabel> has a parent category!
</mt:HasNoParentCategory>
</mt:Categories>

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